Method for driving a light source, light source driving circuit thereof, light source assembly having the light source driving circuit and display apparatus having the same
a technology of light source and driving circuit, which is applied in the direction of lighting and heating apparatus, semiconductor devices for light sources, instruments, etc., can solve the problems of difficult stabilization of color sensors of prior art and increase of manufacturing costs, so as to reduce manufacturing costs and easily compensate color light quantities
Inactive Publication Date: 2008-10-23
SAMSUNG ELECTRONICS CO LTD
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Benefits of technology
The present invention provides a method for driving a light source to compensate for a color light quantity using a light sensor without a color filter. This decreases manufacturing costs and makes it easier to control the color light quantity. The method involves applying driving signals with different reference frequencies to color light sources, sensing the mixed light emitted from the color light sources, and filtering the sensing signal based on the reference frequencies to generate color signals. These color signals are used to generate light quantity control signals that control the quantity of light emitted from each color light source. The light source driving circuit includes a driving control part, a light-sensing part, a filter, and a comparison compensation part. The technical effect of this invention is to provide a more efficient and cost-effective method for controlling the color light quantity in display apparatuses.
Problems solved by technology
As a result, the color sensors of the prior art are difficult to stabilize and manufacturing costs thereof are increased.
Method used
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[0052]The invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout.
[0053]It will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.
[0054]It will be unde...
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A method of driving a light source driving circuit includes: applying driving signals, each having a reference frequency different than the reference frequency of other driving signals, to respective color light sources, each emitting a color light; generating a sensing signal based on a sensed mixed light emitted from the color light sources; filtering the sensing signal based on the reference frequency of each of the driving signals; generating color signals corresponding to each of the color light sources based on the filtered sensing signal; outputting light quantity control signals based on the color signals; and controlling a duty ratio of each of the driving signals based on the light quantity control signals to apply the driving signals, each having the controlled duty ratio, to the color light sources to control a quantity of the color light emitted from each of the color light sources.
Description
[0001]This application claims priority to Korean Patent Application No. 2007-38797, filed on Apr. 20, 2007, and all the benefits accruing therefrom under 35 U.S.C. § 119, the contents of which in its entirety are herein incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method for driving a light source, a light source driving circuit for performing the method, a light source assembly having the light source driving circuit and a display apparatus having the light source driving circuit. More particularly, the present invention relates to a method for driving the light source to enhance a display quality and reduce a manufacturing cost thereof, the light source driving circuit for performing the method, the light source assembly having the light source driving circuit and the display apparatus having the light source driving circuit.[0004]2. Description of the Related Art[0005]Generally, a liquid crystal displ...
Claims
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IPC IPC(8): H05B37/02H05B44/00
CPCG09G3/3413G09G2320/064G09G2320/0666G09G2360/145H05B33/0818H05B33/0869Y02B20/346H05B45/22F21Y2115/10Y02B20/30
Inventor LEE, KI-CHAN
Owner SAMSUNG ELECTRONICS CO LTD